Water-filter



(No Modl.)

J. GRANT.

WATER FILTBR.

No. 399,875. Patented Mar. 19, 1-889.

UNITED STATES ATENT rricn,

.TOTT .lRANT, OF BOSTON, MASSACIISETTS.

WATER-FILTER.

SPECIFICATION forming part of Letters Patent No. 399,875, dated March 19, 1889.

Application filed July 6, 1888. Serial No. 279,195, (No model.)

T0 (ZZ whom it may concern:

Be it known that I, J OTT GRANT, of Boston, in the county of Suffolk and State of Hassachusetts, have invented a new and useful Improvement in lVater-Filters, of which the following, taken in connection with the accompanying drawings, is a specification.

M y invention relates to that class of filters in which the filtration is eteeted by the use ot finely-granulated materialcharcoal, for instaneeinclosed in a case or chamher attached to a water-pipe, the object being to eonstruct a self-cleansing filter that is simple, cheap, and durable. This object I attain by the meehanism shown in the accompanying drawings, in which Figure 1 is an elevation of my filter, represented as attached to a faucet. Fig. 2 is a vertical section of my filter. Fig. 3 is a section through one of the perforated diaphragms used at the ends of the filter for the purpose of rctaining the granulated filtering material, and Fig. 4 is a section showing a modified form of the perforated diaphragm.

In the drawings I have shown my filter made so as to be reversed, ii desired, although it is not necessary to make this filter in this manner, as the cleansing can be eftected without the trouble of reversing the filter or removing it from the faucot, ns will be explained.

The main cylinder or body A of my filter is made as shown in Figs. 1 and 2, one end being provided with a contracted neck, B, having an internal screwthread, K. The other end has a screw-cap, C, also provided with an internal screw, K. The screws K and li are adapted to fit a correspondiug screw made on the discharge end of the faucet, so that the filter may be easily attached to or detaehed from the faucet.

D and l), Fig. 2, are pertorated di:mhragms loosely placed in the ends of the filter-chaml er, resting against shoulders, as shown, pressed apart by the spiral spring S, liig. 2. The spring S, Fig. 2, is made open, as shown, so that the filtering material Il canfreely enter all partsthat is, between the coils and also into the center. instead of the single spring S, two or more may be used.

The chamber of the filter is nearly full of some suitable filtering material properly granulated. The object of not filling the cham ber of the filter full is to allow the upper dia phragm, D, in this case to be depressed by a sudden and violent throw of water, which depression will cause the coils of the spring r to move, thus adjusting the filtering material Il and preventing it from being clogged.

In l ig. 4 I have shown a modified form of the diaphragmthat is, this diaphragm is made with a rim, d (Z, so as to slide more securely in the cylinder and not be s0 lable to get slanted and eaught, and not move readily with the first impulse of the infiowing current of water.

The prinoiple of action of my filter is as follows: The chamber, being but partially full of iiltering material H, will allow the first flow of water, when the stream is suddenly turned on, to strike the uneonfined filtering material ll and violently agitate it. This agitation is aided by the action of the spring S,

which will at first be depressed and then react, thus causing the :filtering material ll to be moved and loosened. So long as the agitation continnes the material ll will be worked, all of the impurities being removed; but a continued flow of water soon causes the filtering material to settle back into its place and to act as a filter so long (tor a reasonable time) as the current is steady. Vr*hen the current is stopped, the parts remain ready to be again acted upon by a sndden turning on of the stream, and the forces will be repeated. -\\'hen desirous to relill my filter, I have only to remove the serew-cap (l and reverso the filter. Then the diaphragm D, spring S, and filling material Il will all fall out, and a new charge can be put in and the parts replaced. To afi:'ord an additional means of eleansing my filter, I make it reversible that is, either end may be attached to the end of the faueetit working with equal eificieney either end up.

I claim phmgms to rest against, the combination of two freely-moving diaphragms, D D, placed In a filter having shou1ders for the dia- ELI) the-ends of the interior ehamber and havl ing between them loosely-packed filtering ma terial II, with the spring S, adapted to hold the two diaphmgms D and D against the said shoulders and to yieid under the sudd en shock j of the nc0ming water and then react automatically, so as to 100sen the filterng mate- IO rial, all c0nstructed snbstantially as described, and for the purpose set forth.

J OTT GRANT. \Vitn esses:

FRANK G. PARKER, WILLIAM EDSON. 

